Three-section drawer slide rail

Abstract

This utility model discloses a three-section drawer slide, including a fixed rail, a middle rail, and a movable rail. The middle rail has a first guide portion and a second guide portion. The first guide portion movably engages with the fixed rail, and the second guide portion movably engages with the movable rail. A first ball bearing assembly is provided between the first guide portion and the fixed rail, and a second ball bearing assembly is provided between the second guide portion and the movable rail. The advantages of this three-section drawer slide are: the use of a cross-shaped engagement and a three-sided ball bearing engagement structure makes the engagement between the fixed rail and the middle rail, and between the middle rail and the movable rail, more stable and reliable. It also ensures that the center of gravity of the movable rail and the middle rail coincides with the center of the fixed rail, effectively enhancing the overall strength of the slide. This results in more stable and smooth operation of the slide, leading to more stable and smooth drawer opening and closing. During use, the slide is less prone to bending and deformation, improving its bending resistance and load-bearing capacity.

Description

Technical Field

[0001] This utility model belongs to the field of furniture technology, and relates to a furniture accessory, particularly a three-section drawer slide for furniture. Background Technology

[0002] Drawer slides are an important component in furniture used to install drawers and enable their movement. Common types include two-section drawer slides and three-section drawer slides. Two-section drawer slides have the limitation that the drawer cannot be pulled out completely, while three-section drawer slides allow the drawer to be pulled out completely and are more widely used.

[0003] Currently, existing three-section drawer slides, such as the Chinese utility model patent application number 2018210648245 entitled "A Three-Section Drawer Slide Assembly," have significant shortcomings. These existing three-section drawer slides have low overall strength, and the centers of gravity of the movable and center rails do not coincide with the center of gravity of the support plate (used to support the center and movable rails) of the fixed rail. This misalignment causes uneven stress on the support plate when bearing the weight of the drawer and external forces during use, making it prone to bending and deformation. This results in poor bending resistance and an inability to meet users' requirements for high-load-bearing furniture hardware, significantly affecting the lifespan of the drawer slides. Therefore, there is an urgent need for a three-section drawer slide that can overcome these defects. Utility Model Content

[0004] The purpose of this utility model is to provide a three-section drawer slide to solve the problems of low overall strength, poor bending resistance and load-bearing capacity of existing three-section drawer slides.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a three-section drawer slide, including a fixed rail, a middle rail and a movable rail. The middle rail is provided with a first guide part and a second guide part. The first guide part is movably engaged with the fixed rail, and the second guide part is movably engaged with the movable rail. A first ball bearing assembly is provided between the first guide part and the fixed rail, and a second ball bearing assembly is provided between the second guide part and the movable rail.

[0006] The first guide portion and the fixed rail are provided with a first receiving position, a second receiving position and a third receiving position in sequence. The first ball assembly is provided with a first ball, a second ball and a third ball. The first ball, the second ball and the third ball are respectively located in the first receiving position, the second receiving position and the third receiving position.

[0007] The second guide portion and the movable rail are provided with a fourth receiving position, a fifth receiving position and a sixth receiving position in sequence. The second ball assembly is provided with a fourth ball, a fifth ball and a sixth ball, which are located in the fourth receiving position, the fifth receiving position and the sixth receiving position respectively.

[0008] Furthermore, the fixed rail is provided with a first guide groove, the first guide part cooperates with the first guide groove, the first guide part can slide along the first guide groove, and the first guide part is provided with a first arc-shaped part, a second arc-shaped part, a third arc-shaped part and a fourth arc-shaped part in sequence, the first arc-shaped part, the second arc-shaped part and the third arc-shaped part respectively form the first receiving position, the second receiving position and the third receiving position with the fixed rail;

[0009] The movable rail is provided with a second guide groove, and the second guide part is provided with a fifth arc-shaped part, a sixth arc-shaped part, a seventh arc-shaped part and an eighth arc-shaped part in sequence. The fifth arc-shaped part, the sixth arc-shaped part and the seventh arc-shaped part respectively form the fourth receiving position, the fifth receiving position and the sixth receiving position with the movable rail.

[0010] Furthermore, both the first guide portion and the second guide portion are shaped like a cross. One end of the first arc-shaped portion is connected to one end of the second arc-shaped portion, one end of the third arc-shaped portion is connected to the other end of the second arc-shaped portion, one end of the fourth arc-shaped portion is connected to the other end of the third arc-shaped portion, the other end of the fourth arc-shaped portion is connected to one end of the fifth arc-shaped portion, the other end of the fifth arc-shaped portion is connected to one end of the sixth arc-shaped portion, the other end of the sixth arc-shaped portion is connected to one end of the seventh arc-shaped portion, the other end of the seventh arc-shaped portion is connected to one end of the eighth arc-shaped portion, and the other end of the eighth arc-shaped portion corresponds to one end of the first arc-shaped portion.

[0011] Furthermore, both the first guide portion and the second guide portion are hollow structures.

[0012] Furthermore, the first ball assembly includes a first ball holder, which is provided with a first ball groove, a second ball groove, and a third ball groove in sequence, and the first ball, the second ball, and the third ball are respectively installed in the first ball groove, the second ball groove, and the third ball groove; the second ball assembly includes a second ball holder, which is provided with a fourth ball groove, a fifth ball groove, and a sixth ball groove in sequence, and the fourth ball, the fifth ball, and the sixth ball are respectively installed in the fourth ball groove, the fifth ball groove, and the sixth ball groove.

[0013] Furthermore, both the first ball bearing cage and the second ball bearing cage are C-shaped.

[0014] Furthermore, a buffer is provided on the fixed rail, and the output end of the buffer is connected to the movable rail.

[0015] Furthermore, the three-section drawer slide also includes a locking handle, which includes a height adjustment mechanism, a left and right adjustment mechanism, a locking mechanism, and a toggle unlocking mechanism on the body.

[0016] The height adjustment mechanism has a push block at its output end, and the push block has a pushing surface. The left and right adjustment mechanism has an insertion block at its output end. The locking mechanism includes an elastic element and a locking block with a slot. The locking block can extend and retract on the body. The elastic element is connected to the locking block. In its natural state, the elastic element applies an elastic force to the locking block, causing the locking block to extend. The toggle unlocking mechanism includes a lever, which is hinged to the body. The lever has a toggle block, which is connected to the locking block. When the lever is toggleed, the locking block retracts to achieve the unlocking function.

[0017] Furthermore, the pushing surface is an inclined plane, the main body is provided with a first guide groove, the push block cooperates with the first guide groove, the push block can slide back and forth along the first guide groove, the height adjustment mechanism includes a first screw and a first adjusting wheel, one end of the first screw is connected to the push block, the main body is provided with a first receiving groove, the first adjusting wheel is rotatably installed in the first receiving groove, the first adjusting wheel is threadedly engaged with the first screw; the main body is provided with a second guide groove, the left and right adjustment mechanism includes a slider, a second screw and a second adjusting wheel, the insert is disposed on the slider, one end of the insert extends out of the main body, the slider is installed in the second guide groove, the slider can slide left and right along the second guide groove, one end of the second screw is connected to the slider, the main body is provided with a second receiving groove, the second adjusting wheel is rotatably installed in the second receiving groove, the second adjusting wheel is threadedly engaged with the second screw.

[0018] Furthermore, the body is provided with a third guide groove, the locking block cooperates with the third guide groove, the locking block can slide along the third guide groove, the elastic element is a spring, one end of the spring is connected to the locking block, and the other end is connected to the body. In the natural state, the spring is in a compressed state, and the spring applies an elastic force to the locking block to make the locking block extend.

[0019] The beneficial effects of this utility model are as follows: Compared with existing three-section drawer slides, this utility model has significant advantages and beneficial effects. Due to the adoption of a cross-shaped fit and three-sided ball bearing fit structure, the cooperation between the fixed rail and the middle rail, and between the middle rail and the movable rail, is more stable and reliable. This ensures that the center of gravity of the movable rail and the middle rail coincides with the center of the fixed rail, thus effectively enhancing the overall strength of the slide. The slide's operation is more stable and smoother, resulting in more stable and smooth drawer opening and closing. During use, the slide is less prone to bending and deformation, greatly improving its bending resistance. At the same time, the even stress distribution also enhances the slide's load-bearing capacity, meeting the needs of users to place more and heavier items, extending the lifespan of the drawer slide, and providing users with a higher quality and more stable user experience. Attached Figure Description

[0020] Figure 1 This is a first perspective view of a three-section drawer slide rail according to an embodiment of this utility model.

[0021] Figure 2 This is a second perspective view of the three-section drawer slide rail according to an embodiment of this utility model.

[0022] Figure 3 This is a front view of a three-section drawer slide rail according to an embodiment of the present invention.

[0023] Figure 4 yes Figure 3 A bottom view.

[0024] Figure 5 This is a schematic diagram of the structure of the three-section drawer slide rail of this utility model embodiment when the movable rail is removed.

[0025] Figure 6 yes Figure 5 The view pointing in the direction of arrow A.

[0026] Figure 7 This is a schematic diagram of the structure of the three-section drawer slide rail of this utility model embodiment when the fixed rail is removed.

[0027] Figure 8 yes Figure 7 View with arrow B pointing in the middle.

[0028] Figure 9 This is a front view of the middle track in an embodiment of this utility model.

[0029] Figure 10 This is a perspective view of the center track in an embodiment of this utility model.

[0030] Figure 11 This is a schematic diagram of the structure when the first ball bearing cage is engaged with the middle rail.

[0031] Figure 12 yes Figure 11The view with the C arrow pointing in the middle.

[0032] Figure 13 This is a 3D view of the first ball bearing cage.

[0033] Figure 14 This is a schematic diagram of the structure when the second ball bearing cage is engaged with the middle rail.

[0034] Figure 15 yes Figure 14 The view with the D-arrow pointing in the middle.

[0035] Figure 16 This is a 3D view of the second ball bearing cage.

[0036] Figure 17 This is a schematic diagram of the structure of the three-section drawer slide rail of this utility model embodiment when the end cap is fixed to the movable rail.

[0037] Figure 18 This is a first perspective view of the locking handle according to an embodiment of the present utility model.

[0038] Figure 19 This is a second perspective view of the locking handle according to an embodiment of the present utility model.

[0039] Figure 20 This is a front view of the locking handle according to an embodiment of the present utility model.

[0040] Figure 21 yes Figure 20 Rear view.

[0041] Figure 22 This is a first structural schematic diagram of the locking handle of this utility model embodiment when the main body is removed.

[0042] Figure 23 This is a schematic diagram of the second structure of the locking handle in this embodiment of the present invention when the main body is removed.

[0043] Figure 24 This is a schematic diagram of the height adjustment mechanism according to an embodiment of the present invention.

[0044] Figure 25 This is a structural diagram of the locking handle installed on the movable rail.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Fixed rail; 2. Movable rail; 3. Middle rail; 4. Buffer; 5. First ball bearing; 6. Second ball bearing; 7. End cap; 8. Locking handle;

[0047] First guide groove 11, fixing plate 12;

[0048] Mounting hole 121;

[0049] Second guide groove 21, retaining edge 22, inserting edge 23, connecting block 24;

[0050] First guide section 31, second guide section 32;

[0051] First arc-shaped portion 311, second arc-shaped portion 312, third arc-shaped portion 313, fourth arc-shaped portion 314;

[0052] Fifth arc-shaped part 321, sixth arc-shaped part 322, seventh arc-shaped part 323, eighth arc-shaped part 324;

[0053] First ball groove 51, second ball groove 52, third ball groove 53;

[0054] Fourth ball groove 61, fifth ball groove 62, sixth ball groove 63;

[0055] Mating surface 71, slot 72;

[0056] 81. Body; 82. Height adjustment mechanism; 83. Left and right adjustment mechanism; 84. Locking mechanism; 85. Toggle unlocking mechanism;

[0057] Mounting hole 811, first receiving groove 812, second receiving groove 813;

[0058] Push block 821, first screw 822, first adjusting wheel 823;

[0059] 8211;

[0060] Slider 831, second screw 832, second adjusting wheel 833;

[0061] Insert block 8311, flexible edge 8312;

[0062] Lock block 841;

[0063] Card slot 8411, mounting hole 8412, groove 8413;

[0064] lever 851;

[0065] 8511 toggle block, 8512 toggle unit. Detailed Implementation

[0066] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0067] like Figure 1-4As shown, this embodiment features a three-section drawer slide, comprising a fixed rail 1, a middle rail 3, and a movable rail 2. The middle rail 3 is movably connected to both the fixed rail 1 and the movable rail 2. The fixed rail 1 is fixedly mounted on the furniture body, and the drawer is mounted on the movable rail 2. (Refer to...) Figure 5 and Figure 6 The fixed rail 1 has a first guide groove 11 machined on it, which extends through the length of the fixed rail 1. The fixed rail 1 also has an L-shaped fixing plate 12 machined on it, with multiple mounting holes 121 machined on the fixing plate 12. (Refer to...) Figure 7 and Figure 8 The movable rail 2 has a second guide groove 21 machined on it, which runs through the length of the movable rail 2. The movable rail 2 also has a retaining edge 22, an insert edge 23, and a connecting block 24 machined on it. The retaining edge 22 and the insert edge 23 are located near both ends of the movable rail 2, with one end of the retaining edge 22 extending outwards. A buffer 4 is installed on the fixed rail 1, and the output end of the buffer 4 is connected to the connecting block 24 of the movable rail 2.

[0068] Reference Figure 9 and Figure 10 The middle rail 3 is respectively machined with a first guide part 31 and a second guide part 32. The second guide part 32 is located above the first guide part 31. The first guide part 31 and the second guide part 32 are symmetrical in shape. The first guide part 31 and the second guide part 32 are both in the shape of a cross. The first guide part 31 and the second guide part 32 are both hollow structures.

[0069] Upper edge of the first guide section 31 Figure 9 The middle arrow direction has sequentially machined concave first arc-shaped portion 311, second arc-shaped portion 312, third arc-shaped portion 313, and fourth arc-shaped portion 314, and the upper edge of the second guide portion 32... Figure 9 The fifth arc-shaped portion 321, the sixth arc-shaped portion 322, the seventh arc-shaped portion 323, and the eighth arc-shaped portion 324 are sequentially machined in the direction of the arrow F. One end of the first arc-shaped portion 311 is connected to one end of the second arc-shaped portion 312, one end of the third arc-shaped portion 313 is connected to the other end of the second arc-shaped portion 312, one end of the fourth arc-shaped portion 314 is connected to the other end of the third arc-shaped portion 313, the other end of the fourth arc-shaped portion 314 is connected to one end of the fifth arc-shaped portion 321, the other end of the fifth arc-shaped portion 321 is connected to one end of the sixth arc-shaped portion 322, the other end of the sixth arc-shaped portion 322 is connected to one end of the seventh arc-shaped portion 323, the other end of the seventh arc-shaped portion 323 is connected to one end of the eighth arc-shaped portion 324, and the other end of the eighth arc-shaped portion 324 corresponds to and is separate from one end of the first arc-shaped portion 311.

[0070] The first guide portion 31 is clearance-fitted with the first guide groove 11 of the fixed rail 1, and the first guide portion 31 can slide along the first guide groove 11. The first arc-shaped portion 311, the second arc-shaped portion 312, and the third arc-shaped portion 313 respectively form a first receiving position, a second receiving position, and a third receiving position with the fixed rail 1. (Refer to...) Figure 6 A first ball assembly is installed between the first guide portion 31 and the fixed rail 1. The first ball assembly includes a first ball cage 5 with a "C" shape. When the first ball cage 5 cooperates with the first guide portion 31 of the middle rail 3, it is as follows: Figure 11 and Figure 12 As shown, refer to Figure 13 The first ball bearing holder 5 is sequentially machined with a first ball groove 51, a second ball groove 52, and a third ball groove 53, each containing a first ball, a second ball, and a third ball (not shown in the attached diagram). When the first ball assembly is installed between the first guide portion 31 and the fixed rail 1, the first ball, the second ball, and the third ball are located in the first receiving position, the second receiving position, and the third receiving position, respectively.

[0071] The second guide portion 32 is clearance-fitted with the second guide groove 21 of the movable rail 2, allowing the second guide portion 32 to slide along the second guide groove 21. The fifth arc-shaped portion 321, the sixth arc-shaped portion 322, and the seventh arc-shaped portion 323 respectively form the fourth, fifth, and sixth receiving positions with the movable rail 2. (Refer to...) Figure 8 A second ball assembly is installed between the second guide section 32 and the movable rail 2. The second ball assembly includes a second ball carrier 6 with a "C" shape. When the second ball carrier 6 mates with the second guide section 32 of the middle rail 3, it is as follows: Figure 14 and Figure 15 As shown, refer to Figure 16 The second ball bearing holder 6 is sequentially machined with a fourth ball bearing groove 61, a fifth ball bearing groove 62, and a sixth ball bearing groove 63, which respectively contain a fourth ball, a fifth ball, and a sixth ball (not shown in the attached diagram). When the second ball bearing assembly is installed between the second guide portion 32 and the movable rail 2, the fourth ball, the fifth ball, and the sixth ball are located in the fourth receiving position, the fifth receiving position, and the sixth receiving position, respectively.

[0072] Reference Figure 17 An end cap 7 is inserted into one end of the movable rail 2, and the end cap 7 is fixed to the movable rail 2. One end of the end cap 41 is machined with a slot 72 and a mating surface 71. The mating surface 71 is located on the upper side of the slot 72 and is a bevel.

[0073] The three-section drawer slide also includes a locking handle 8, see reference. Figure 18-21The locking handle 8 includes a body 81 with three mounting holes 811 machined on it. The body 81 is equipped with a height adjustment mechanism 82, a left-right adjustment mechanism 83, a locking mechanism 84, and a toggle unlocking mechanism 85. The height adjustment mechanism 82 adjusts the height of the drawer, the left-right adjustment mechanism 83 adjusts the left-right position of the drawer, the locking mechanism 84 secures the locking handle 8 to the three-section drawer slide rail, thus fixing the drawer to the three-section drawer slide rail, and the toggle unlocking mechanism 85 unlocks the drawer, allowing the locking handle 8 to be removed from the three-section drawer slide rail, thus removing the drawer from the three-section drawer slide rail.

[0074] Reference Figure 22-24 The height adjustment mechanism 82 includes a push block 821 with a push surface 8211, a first screw 822, and a first adjusting wheel 823. A first guide groove is machined on the body 81. The push block 821 engages with the first guide groove, allowing it to slide back and forth along the first guide groove. Figure 21 Slide in the direction of arrow E, one end of the first screw 822 is connected to the push block 821, see reference. Figure 19 The main body 81 has a first receiving groove 812 machined on it. A first adjusting wheel 823 is rotatably installed in the first receiving groove 812. The first adjusting wheel 823 is threadedly engaged with the first screw 822. Rotating the first adjusting wheel 823 adjusts the front and rear position of the push block 821. In a preferred design, the first adjusting wheel 823 is a first adjusting gear, and a first threaded hole is machined in the middle of the first adjusting gear. The first threaded hole is threadedly engaged with the first screw 822. The pushing surface 8211 of the push block 821 is designed as an inclined surface.

[0075] Reference Figure 22 and Figure 23 The left-right adjustment mechanism 83 includes a slider 831, a second screw 832, and a second adjusting wheel 833. A block 8311 is machined onto the slider 831, and a second guide groove is machined onto the body 81. The slider 831 is installed in the second guide groove and can slide left and right along the second guide groove. Figure 4 The slider 8311 slides in the direction of arrow F, with one end of the insert 8311 extending outside the body 81. One end of the second screw 832 is connected to the slider 831. A second receiving groove 813 is machined on the body 81, and a second adjusting wheel 833 is rotatably mounted in the second receiving groove 813. The second adjusting wheel 833 is threadedly engaged with the second screw 832. Rotating the second adjusting wheel 833 adjusts the left and right positions of the slider 831, thereby adjusting the left and right positions of the insert 8311. Preferably, the second adjusting wheel 833 is a second adjusting gear, with a second threaded hole machined in the middle, which is threadedly engaged with the second screw 832. (Refer to...) Figure 22 and Figure 23An elastic edge 8312 is machined on one side of the upper block 8311 of the slider 831, and one end of the elastic edge 8312 extends outward at an angle to the outside of the body 81.

[0076] The body 81 is machined with a third guide groove. The locking mechanism 84 includes an elastic element (not shown in the attached drawings) and a locking block 841 with a slot 8411 machined thereon. The locking block 841 can extend and retract on the body 81, that is, the locking block 841 can extend and retract on the body 81. Figure 21 The movement extends and retracts in the direction of arrow F. The elastic element is designed as a spring, referencing... Figure 22 and Figure 23 The locking block 841 has a fitting hole 8412. One end of the spring is fitted into the fitting hole 8412, and the other end is connected to the body 81. In its natural state, the spring is in a compressed state, and the spring applies an elastic force to the locking block 841, causing the locking block 841 to extend.

[0077] Reference Figure 22 and Figure 23 The toggle unlocking mechanism 85 includes a lever 851, which is hinged to the body 81. One end of the lever 851 has a toggle block 8511, and one side of the locking block 841 has a groove 8413 shaped like a "︹", which engages with the toggle block 8511. A toggle part 8512 is machined on the lever 851, extending beyond the body 81, and is textured with anti-slip patterns. Figure 21 When the lever 851 is moved in the direction of arrow G, the lever 851 drives the lock block 841 to retract, thereby unlocking the device.

[0078] When the locking handle 8 is installed on the movable rail 2 of the drawer slide, such as Figure 25 As shown. The insert block 8311 is inserted into the slot 72 of the end cover 7. The pushing surface 8211 of the push block 821 corresponds to and abuts against the mating surface 71 of the end cover 7. The retaining edge 22 engages with the retaining groove 8411 of the locking block 841. Along... Figure 21 The lever 8512 is moved in the direction of arrow G, causing the locking block 841 to retract, thereby disengaging the locking edge 22 from the locking groove 8411 and unlocking the drawer. At this time, the locking handle 8 can be removed from the movable rail 2, thereby removing the drawer from the three-section drawer slide rail.

[0079] The principle of assembling and disassembling the drawer on the three-section drawer slide in this embodiment is as follows: the locking handle 8 is installed at the bottom of the drawer, the insert edge 23 of the movable rail 2 is inserted into the groove on the back of the drawer, the pin 82 of the locking handle 8 is inserted into the slot 71 of the end cover 7 of the movable rail 2, and the slot 831 of the locking block 83 of the locking handle 8 cooperates with the slot edge 22 of the movable rail 2. At this time, the drawer is installed on the movable rail 2 of the three-section drawer slide. When it is necessary to remove the drawer from the three-section drawer slide, the lever 851 of the locking handle 8 is moved, so that the slot edge 42 of the movable rail 2 disengages from the slot 8411 of the locking handle 8, and the drawer can then be removed from the three-section drawer slide.

[0080] The principle of adjusting the height and left and right position of the drawer is as follows: rotating the first adjusting wheel 823 causes the push block 821 to move back and forth, thereby adjusting the height of the drawer; rotating the second adjusting wheel 833 causes the insert block 8311 to move left and right, thereby adjusting the left and right position of the drawer.

[0081] Compared with existing technologies, the advantages of this utility model's three-section drawer slide are:

[0082] 1. The structure of the center rail has been optimized, enhancing its strength. A cross-shaped guide section is incorporated into the center rail to mate with the fixed and movable rails, ensuring precise positioning and stable connection of the fixed, center, and movable rails in both horizontal and vertical directions. This aligns the center of gravity of the movable and center rails with that of the fixed rail, effectively solving the problem of easy bending and deformation of the support vertical plate in existing drawer slides. This significantly enhances the overall strength and bending resistance of the slides. In practical use, it can withstand heavier drawer loads and is less prone to deformation and damage even after long-term use, thus improving the product's lifespan and reliability.

[0083] 2. Three-sided ball bearing engagement is used between the mating surfaces of the fixed rail and the middle rail, and between the middle rail and the sliding rail. These balls are evenly distributed between the rails and the sliding components, creating rolling friction. This significantly reduces friction during use, making the drawer smoother and easier to open and close, thus improving the user experience. At the same time, this design also reduces wear between components, further extending the lifespan of the drawer.

[0084] 3. The three-section drawer slide of this utility model is also equipped with a quick-release two-dimensional adjustable locking handle, which makes it easy and quick to disassemble and assemble the drawer. The height and left and right positions of the drawer can be adjusted by locking the handle, that is, the two-dimensional adjustable drawer. The adjustment is flexible and convenient, which can better meet the needs of diverse adjustment of drawer position in actual use.

[0085] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A three-section drawer slide, comprising a fixed rail (1), a middle rail (3), and a movable rail (2), wherein the middle rail (3) is provided with a first guide portion (31) and a second guide portion (32), the first guide portion (31) being movably engaged with the fixed rail (1), the second guide portion (32) being movably engaged with the movable rail (2), a first ball bearing assembly being provided between the first guide portion (31) and the fixed rail (1), and a second ball bearing assembly being provided between the second guide portion (32) and the movable rail (2), characterized in that: The first guide part (31) and the fixed rail (1) are provided with a first receiving position, a second receiving position and a third receiving position in sequence. The first ball assembly is provided with a first ball, a second ball and a third ball. The first ball, the second ball and the third ball are respectively located in the first receiving position, the second receiving position and the third receiving position. The second guide part (32) and the movable rail (2) are provided with a fourth receiving position, a fifth receiving position and a sixth receiving position in sequence. The second ball assembly is provided with a fourth ball, a fifth ball and a sixth ball. The fourth ball, the fifth ball and the sixth ball are respectively located in the fourth receiving position, the fifth receiving position and the sixth receiving position.

2. The three-section drawer slide rail according to claim 1, characterized in that, The fixed rail (1) is provided with a first guide groove (11), and the first guide part (31) cooperates with the first guide groove (11). The first guide part (31) can slide along the first guide groove (11). The first guide part (31) is provided with a first arc-shaped part (311), a second arc-shaped part (312), a third arc-shaped part (313) and a fourth arc-shaped part (314) in sequence. The first arc-shaped part (311), the second arc-shaped part (312) and the third arc-shaped part (313) respectively form the first receiving position, the second receiving position and the third receiving position with the fixed rail (1). The movable rail (2) is provided with a second guide groove (21), and the second guide part (32) is provided with a fifth arc-shaped part (321), a sixth arc-shaped part (322), a seventh arc-shaped part (323) and an eighth arc-shaped part (324) in sequence. The fifth arc-shaped part (321), the sixth arc-shaped part (322) and the seventh arc-shaped part (323) respectively form the fourth receiving position, the fifth receiving position and the sixth receiving position with the movable rail (2).

3. The three-section drawer slide rail according to claim 1, characterized in that, The first guide portion (31) and the second guide portion (32) are both in the shape of a cross. One end of the first arc-shaped portion (311) is connected to one end of the second arc-shaped portion (312). One end of the third arc-shaped portion (313) is connected to the other end of the second arc-shaped portion (312). One end of the fourth arc-shaped portion (314) is connected to the other end of the third arc-shaped portion (313). The other end of the fourth arc-shaped portion (314) is connected to one end of the fifth arc-shaped portion (321). The other end of the fifth arc-shaped portion (321) is connected to one end of the sixth arc-shaped portion (322). The other end of the sixth arc-shaped portion (322) is connected to one end of the seventh arc-shaped portion (323). The other end of the seventh arc-shaped portion (323) is connected to one end of the eighth arc-shaped portion (324). The other end of the eighth arc-shaped portion (324) corresponds to one end of the first arc-shaped portion (311).

4. The three-section drawer slide rail according to claim 1, 2, or 3, characterized in that, Both the first guide part (31) and the second guide part (32) are hollow structures.

5. The three-section drawer slide rail according to claim 1, characterized in that, The first ball assembly includes a first ball holder (5), which is provided with a first ball groove (51), a second ball groove (52) and a third ball groove (53) in sequence. The first ball, the second ball and the third ball are respectively installed in the first ball groove (51), the second ball groove (52) and the third ball groove (53). The second ball assembly includes a second ball holder (6), which is provided with a fourth ball groove (61), a fifth ball groove (62) and a sixth ball groove (63) in sequence. The fourth ball, the fifth ball and the sixth ball are respectively installed in the fourth ball groove (61), the fifth ball groove (62) and the sixth ball groove (63).

6. The three-section drawer slide rail according to claim 5, characterized in that, Both the first ball bearing cage (5) and the second ball bearing cage (6) are C-shaped.

7. The three-section drawer slide rail according to claim 1, characterized in that, The fixed rail (1) is provided with a buffer (4), and the output end of the buffer (4) is connected to the movable rail (2).

8. The three-section drawer slide rail according to claim 1, characterized in that, The three-section drawer slide also includes a locking handle (8), which includes a height adjustment mechanism (82), a left and right adjustment mechanism (83), a locking mechanism (84), and a toggle unlocking mechanism (85) on the body (81); The height adjustment mechanism (82) has a push block (821) at its output end, and the push block (821) has a pushing surface (8211). The left and right adjustment mechanism (83) has an insert block (8311) at its output end. The locking mechanism (84) includes an elastic element and a locking block (841) with a slot (8411). The locking block (841) can extend and retract on the body (81). The elastic element is connected to the locking block (841) in a natural state. When in the state, the elastic element applies an elastic force to the lock block (841), causing the lock block (841) to extend. The toggle unlocking mechanism (85) includes a lever (851), which is hinged to the body (81). The lever (851) is provided with a toggle block (8511), which is connected to the lock block (841). When the lever (851) is toggleed, the lock block (841) retracts to achieve the unlocking function.

9. The three-section drawer slide rail according to claim 8, characterized in that, The pushing surface (8211) is an inclined surface. The body (81) is provided with a first guide groove. The push block (821) cooperates with the first guide groove and can slide back and forth along the first guide groove. The height adjustment mechanism (82) includes a first screw (822) and a first adjusting wheel (823). One end of the first screw (822) is connected to the push block (821). The body (81) is provided with a first receiving groove (812). The first adjusting wheel (823) is rotatably installed in the first receiving groove (812) and is threadedly engaged with the first screw (822). The body (81) is provided with a second guide groove for left and right adjustment. The mechanism (83) includes a slider (831), a second screw (832), and a second adjusting wheel (833). The insert (8311) is disposed on the slider (831), one end of the insert (8311) extends out of the body (81). The slider (831) is installed in the second guide groove and can slide left and right along the second guide groove. One end of the second screw (832) is connected to the slider (831). The body (81) is provided with a second receiving groove (813). The second adjusting wheel (833) is rotatably installed in the second receiving groove (813) and is threadedly engaged with the second screw (832).

10. The three-section drawer slide rail according to claim 8, characterized in that, The body (81) is provided with a third guide groove, the locking block (841) cooperates with the third guide groove, the locking block (841) can slide along the third guide groove, the elastic element is a spring, one end of the spring is connected to the locking block (841), and the other end is connected to the body (81). In its natural state, the spring is in a compressed state, and the spring applies an elastic force to the locking block (841) to make the locking block (841) extend.

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